Disk not ejected properly

I am having the same issue. I am a video editor and I am using Adobe Premiere Pro CC 12.0.0 on macOS High Sierra 10.13.1 on a BRAND NEW 2017 iMac 27". Randomly when editing (and I do mean RANDOMLY) I get this dreaded "Disk Not Ejected Properly" with regard to the LaCie 12 TB external harddrive that I am using that has the footage on it. Sometimes I can keep editing. Sometimes I cannot. It seems to be getting worse. This is a VERY BIG PROBLEM as I have to reboot CONSTANTLY and I am losing valuable time on my editing. I very seriously need a fix for this. Note that I have unchecked the "put hard disks to sleep" and that seemed to help slighly at first, but now I am having to reboot and remount my drive over and over and over. Someone. Please. Fix. This.

Apple Support recommended I reset the SMC, which I was very skeptical of as a solution due to its simplicity. It worked for a little bit and the problem has now persisted, but maybe it works for some of you out there. Here are the (very easy) steps:

1 Choose Apple menu > Shut Down.

2 After your Mac shuts down, unplug the power cord.

3 Wait 15 seconds.

4 Plug the power cord back in.

5 Wait 5 seconds, then press the power button again to turn on your Mac.

If it's enabled, disable Power Nap.

I've tried that to no avail. Sometimes the moment I boot up it comes up with the error. Sometimes it is three hours. Sometimes it is ten minutes. It seems to be totally at random. I could be idle or working - there seems to be no pattern whatsoever. Note that I have the drive connected using a Thunderbolt Mini connected to an Apple brand adapter for the older style Thunderbolt to plug into the LaCie drive. Not sure if that is part of the issue or not - but I have no choice as there is no other way to connect the drive.

Sorry it didn't help. I was having the same random behavior with WD drives. Turning off Power Nap worked for me.

How has Apple not addressed this issue? Has anyone figured out a solution?

I am having the same problem. I suspect it started to appear with 10.13.2 that I am running now. I have three external USB drives on my iMac. All of them randomly inform this one - I might have many many messages of this while I am gone - this . I turned off power nap, I turned off put hard disks to sleep when possible. Still getting the same error - disks dropping randomly off when system is sleeping

>started to appear with 10.13.2 that I am running now

Not being on a beta, you're in the wrong forums.

Apple Developer Forums is a community for discussing developer-level issues with Apple’s SDKs and tools. It is not an official Apple support channel, even for developer issues, and it’s definitely not the right place to feedback/get answers about user-level issues.

User-centric queries/comments such as this are perhaps best put to AppleCare's public community support forums, Apple's twitter support account and/or Apple’s YouTube Support Channel vs. risking off-topic here in the DevForums, thanks and good luck.

https://support.apple.com/

Users can feedback via http://www.apple.com/feedback/ - Individuals using betas are free to use the Feedback Assistant; Devs can use the 'Report Bugs' link, below right.

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For what is worth I've been having the same problem I'm on 10.13.3 on a new Mac Pro. This was also a problem I experienced on older versions of OSX. Perhaps a the OSX developers could include a permanent updated that could fix this? Or is there a some code to eneble some incative support via Terminal?

Any work around at all would really be useful.

> I encounter the problem only after updating to 10.13.3

Since your are not on a beta, you are using the wrong forums.

Apple Developer Forums is a community for discussing developer-level issues with Apple’s SDKs and tools. It is not an official Apple support channel, even for developer issues, and it’s definitely not the right place to feedback/get answers about user-level issues.

User-centric queries/comments such as this are perhaps best put to AppleCare's public community support forums, Apple's twitter support account and/or Apple’s YouTube Support Channel vs. risking off-topic here in the DevForums, thanks and good luck.

https://support.apple.com/

Users can feedback via http://www.apple.com/feedback/ - Individuals using betas are free to use the Feedback Assistant; Devs can use the 'Report Bugs' link, below right.

________________

I have exactly the same problem. I'm trying another suggestion--checking off the option in system prefereces for hard disk to go to sleep. I'll see how that works out.

Music professional using High Sierra 10.13.3, new Macbook Pro w touchbar. 1 week old. My main Glyph Studio Mini is connected for two seconds and then i get "disk not ejected properly" ...then it mounts, then its ejected, ad infinitum....

Dive is connected via (1 of my three NEW) USB-c to usb adapters. What is going on? I've been to the Apple store. Useless waste of time. Expecting a call tomorrow from tech help supposrt but not feeling confident.

The same drive works perfectly on my mid-2010 MBP and has so for the last 2.5 years.

This is SO frustrating! I can't even copy a large file from the drive to the desk top without the drive being ejected. Can't work!!

I had this exact problem when I installed a Western Digital "My Password Pro" Thunderbolt drive : it mounted for 2 seconds and then automatically ejected, with the warning "Disk not ejected properly". And then it started all over again.

Found the culprit : When I installed my new WD drive, their software "WD Drive Utilities" was installed in the process.

Now, launching this software will install a Startup item (I forgot its name) in the User/Startup Items Preferences which will then launch upon Restart.

Removing this Startup item cured the eject problem forever.

Could it be the same type of Startup Item that installs with your Glyph Studio MIni ?

so I was getting all these error and not ejected properly messages on my MacBook Pro 2016 ru\nning t\he latest OS high Sierra, and the hard drive just stopped working across all devices. Looks like my seagate 4 tb portable is fried. Now for the data recovery and a new hard drive. I have ju\st ordered a USb C hard drive. Hopefully that fares better. Sheez. What a waste, Apple! You just cost me a bundle of time and money. Phoooey to High Sierra. Stay away if you can.

"Could it be the same type of Startup Item that installs with your Glyph Studio MIni ?"

Thanks but no installation of software is necessary with this drive. It's just plug in and go. USB powered 1TB 7200rpm. I checked the Startupitems folder anyway but nothing there... what you suggested has made me wonder if the drive is actually running something in the background.... thx again.